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https://issues.apache.org/jira/browse/HDFS-8660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14613063#comment-14613063
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Harsh J commented on HDFS-8660:
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This would be an excellent improvement for certain performance troubleshooting.
In looking for more such "Slow" messages, the following matches may also need
similar changes:
The "Slow ReadProcessor" message in DataStreamer.java can benefit from a block
ID.
The "Slow waitForAckedSeqno" in DataStreamer.java message too could benefit
from a block ID as well as a nodes list.
Just Block ID can also be added into the below messages under
BlockReceiver.java:
"Slow flushOrSync"
"Slow BlockReceiver write data to disk"
"Slow manageWriterOsCache"
DN Mirror Host+Block ID can both be added into the below message under
BlockReceiver.java:
"Slow PacketResponder send ack to upstream took"
Could you check if these are possible to do as part of the same JIRA as simple
changes too?
> Slow write to packet mirror should log which mirror and which block
> -------------------------------------------------------------------
>
> Key: HDFS-8660
> URL: https://issues.apache.org/jira/browse/HDFS-8660
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 2.7.0
> Reporter: Hazem Mahmoud
> Assignee: Hazem Mahmoud
>
> Currently, log format states something similar to:
> "Slow BlockReceiver write packet to mirror took 468ms (threshold=300ms)"
> For troubleshooting purposes, it would be good to have it mention which block
> ID it's writing as well as the mirror (DN) that it's writing it to.
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